Trigger CSS Animations in JavaScript

Question

I don\'t know how to use JQuery, so I need a method which could trigger an animation using JavaScript only.

I need to call/trigger CSS Animation when the user scrol

Answer 1

If you want Animations i recommend you create a CSS class which you toggle on a Condition whit JS: CSS

.animation {
 animation: anim 2s ease infinite;
 transition: .2s
}

JS

// Select your Element

$element.document.querySelector(".yourElement");
$element.addEventListner('click', () => {
 $element.classList.toggle("animation")
})

Answer 2

You could use CSS to hide the image / animation and show when the user scrolls. This would work like this:

CSS:

div {
    border: 1px solid black;
    width: 200px;
    height: 100px;
    overflow: scroll;
}

#demo{
    display: none;
}

HTML:

<div id="myDIV"> </div>

<div id="demo">
     <img src="earthlogo.gif" id="earthlogo" alt="Thanks for scrolling. Now you see me">
</div>

Your javascript just needs to include an eventListener to call the function which triggers the display of your animation.

JS:

document.getElementById("myDIV").addEventListener("scroll", start);

function start() {
    document.getElementById('demo').style.display='block';
}

Answer 3

Here's the main code:

HTML:

<img id="myImg">

CSS:

#myImg {
    //properties
    animation: animate 2s linear infinite //infinite is important!
}
@keyframes animate {
    //animation base
}

JS:

document.getElementById("myImg").style.webkitAnimationPlayState = "paused";
window.addEventListener("scroll", function() {
    document.getElementById("myImg").style.webkitAnimationPlayState = "running";
    setTimeout(function() {
        document.getElementById("myImg").style.webkitAnimationPlayState = "paused";
    }, 2000);
});

Answer 4

Vanilla JS version

document.getElementById('logo').classList.add("anim");
document.getElementById('earthlogo').classList.add("anim2");

Answer 5

The simplest method to trigger CSS animations is by adding or removing a class - how to do this with pure Javascript you can read here:

How do I add a class to a given element?

If you DO use jQuery (which should really be easy to learn in basic usage) you do it simply with addClass / removeClass.

All you have to do then is set a transition to a given element like this:

.el {
    width:10px;
    transition: all 2s;
}

And then change its state if the element has a class:

.el.addedclass {
    width:20px;
}

Note: This example was with transition. But for animations its the same: Just add the animation on the element which has a class on it.

There is a similar question here: Trigger a CSS keyframe animation via scroll

Answer 6

I have a similar problem. The best answer didn’t work for me, but when I added the delay it worked. The following is my solution.

CSS

.circle_ani1,
.circle_ani2 {
    animation-duration: 1s;
    animation-iteration-count: 1;
}

.circle_ani1 {
    animation-name: circle1;
}

.circle_ani2 {
    animation-name: circle2;
}

JS

let temp_circle1 = $('.TimeCountdown_circle1').removeClass('circle_ani1');
let temp_circle2 = $('.TimeCountdown_circle2').removeClass('circle_ani2');
window.setTimeout(function() {
    temp_circle1.addClass('circle_ani1');
    temp_circle2.addClass('circle_ani2');
}, 50);